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3/8" dovetail rings are normally used on grooved receivers. Grooved receivers have cuts running lengthwise in the top of the gun deep enough for the claws of the rings to firmly grip on. Grooved receivers are normally found on 22 rifles and airguns (although some European 22s and air rifles have grooves that are 11mm or 13mm). Sometimes there is actually a 3/8" base screwed onto the receiver instead of grooves cut into it, often because of lack of metal thickness of the receiver.
These 3/8" rings may have a circular diameter to hold a scope with a main tube of 30mm, one inch, 7/8", 3/4", or others. A standard 22 ring might be called a "one inch tip-off", or a "one inch 22 ring", or a "one inch 3/8" dovetail ring".
Some grooved receiver 22s are drilled and tapped for Weaver style bases. It is prudent to use these much larger bases if available. Weaver style bases simply offer more area for the rings to grab.
